51644183040 has 320 divisors, whose sum is σ = 194239710720. Its totient is φ = 12961382400.

The previous prime is 51644183033. The next prime is 51644183053. The reversal of 51644183040 is 4038144615.

51644183040 is a `hidden beast` number, since 5 + 1 + 644 + 1 + 8 + 3 + 0 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51644182986 and 51644183004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1153065 + ... + 1197015.

It is an arithmetic number, because the mean of its divisors is an integer number (606999096).

Almost surely, 2^51644183040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51644183040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97119855360).

51644183040 is an abundant number, since it is smaller than the sum of its proper divisors (142595527680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51644183040 is a wasteful number, since it uses less digits than its factorization.

51644183040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44000 (or 43978 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 51644183040 in words is "fifty-one billion, six hundred forty-four million, one hundred eighty-three thousand, forty".